U.S. officials have pinpointed a likely suspect behind the “sonic attacks” that caused brain injuries to American government workers in Cuba and China.

According to five unnamed sources, Russia is the main suspect in the ongoing investigation, reports NBC News.

Evidence from signals intelligence, which is essentially communications intercepts, has pointed to Russia. The intelligence has been compiled through the work of the FBI, the CIA, and other agencies, but NBC notes that their sources “declined to elaborate on the nature of the intelligence.”

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